CBSE Class 12 Physics Question Paper 2025 Code 55/S/1

CBSE CLASS XII Questions

• 1.

  Draw the plot of potential energy of a pair of nucleons as a function of their separation. Write two important conclusions that can be drawn from this plot.

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• 2.

  In a region, the electric potential varies as \(V = 10 - 50x\), where \(V\) is in volts and \(x\) is in meters. The electric field in the region is

  • \(10\ \text{N/C}\) along \(+x\)
    
  • \(10\ \text{N/C}\) along \(-x\)
    
  • \(50\ \text{N/C}\) along \(+x\)
    
  • \(50\ \text{N/C}\) along \(-x\)
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• 3.

  (I) The real image of an object placed between $f$ and $2f$ from a convex lens can be seen on a screen placed at the image location. If the screen is removed, is the image still there? Explain.

  (II) Plane and convex mirrors produce virtual images of objects. Can they produce real images under some circumstances? Explain.

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• 4.

  Consider the nuclear reaction \( X \to Y + Z \). Let \( M_x \), \( M_y \), and \( M_z \) be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?

  • \( (M_x - M_z)<M_y \)
    
  • \( (M_x - M_y)<M_z \)
    
  • \( M_x>(M_y + M_z) \)
    
  • \( M_x<(M_y + M_z) \)
    
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• 5.

  A rectangular loop of size 5 cm $\times$ 8 cm is lying in the $x$-$y$ plane in a uniform magnetic field $\vec{B} = (2.0\ \text{T})\hat{k}$. The total magnetic flux linked with the loop is:

  • 80 Wb
    
  • 16 Wb
    
  • \(8 \times 10^{-2}\) Wb
    
  • \(8 \times 10^{-3}\) Wb
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• 6.

  Find the ratio $\dfrac{\lambda_\alpha}{\lambda_p}$ of the de Broglie wavelength $\lambda_\alpha$ associated with an alpha particle to the de Broglie wavelength $\lambda_p$ associated with a proton if both are moving with the same velocity.

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